Fig. 3: A schematic diagram to illustrate H2O transport scheme via subducting talc.
From: Formation of the 15 Å phase as the most expanded hydrated mineral in cold subduction zone
a The structural evolution of talc under modeled subduction fluid environment in cold subduction system: subducting talc (a, olive colored region) breakdowns into the super-hydrated 15 Å phase and magnesite assemblage in the depth range of ~90–125 km (b, pink colored region), followed by partial dehydration of the super-hydrated 15 Å phase into the 10 Å phase assemblage below ~165 km depth (c, brown colored region). b Estimations of H2O fluxes of subducting talc and global subducting slabs; boxes filled in pink and yellow are for subducting talc in cold and warm subduction zones, respectively, while boxes filled in navy are for global subducting slabs (based on the literature as summarized in Table 1). The boxes filled in light pink by dotted lines are enhanced estimations in the H2O fluxes to account the super-hydration and subsequent partial dehydration via the 15 Å phase (see Table 1 for the volatiles budget estimations). Depth ranges for subducting slab are shown in parenthesis. c H2O transport capacity of subducting talc compared to global subducting slabs by depths.
